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| 1890 gyroscope design by "sire" | large lecture gyroscope | 1881 ritchie of boston gyroscope | scientific apparatus company of yonkers |
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| c. h. stoelting co. of chicago. | plücker and fessel type gyroscope | maker james w. queen of philadelphia | large 1920s plücker and fessel type gyroscope |
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| 1860 "gyrascope" [sic] | post 1900 czech gyroscope | 1950's sperry gyroscope | 1900 lecture style gyroscope |
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| spinning top device. shows gyroscopic forces | british built "linaze" gyroscope (1980s ?) | a prototype, production and brass models | |
